Biden secures Democratic nomination with majority of delegates, NBC News projects

President Joe Biden clinched the Democratic presidential nomination Tuesday, NBC News projects,winning a majority of the necessary delegates and setting up what is expected to be a bitter, closely contested rematch with Donald Trump.

The outcome had never been much in doubt. Biden faced token opposition as the party's biggest names — Govs. Gavin Newsom of California and Gretchen Whitmer of Michigan, among them — opted to sit out the race rather than challenge a sitting president who had already beaten Trump once.

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By clearing the field for the 81-year-old Biden, Democrats have gambled that he remains the party's best shot at defeating Trump one more time. The November election will help determine whether that bet pays off. Some party activists have their doubts.

"He [Biden] was forced on us by the establishment, but he is manifestly not the same man that he was even three years ago, and that has made him less optimally fit for the office, if not simply unfit," Liano Sharon, a Democratic National Committee member from Michigan, said in an interview.

The general election campaign opens with Biden an underdog against an opponent who historians have ranked as the worst president in the nation's history.

Age remains Biden's glaring vulnerability, polling shows. His State of the Union speech last week was a chance to reassure voters about his fitness, and his performance may have quelled some of voters' misgivings. Biden delivered his 68-minute speech with unusual